Help Children Subtract Single-Digit Numbers with Colorful, Engaging Flashcards Brought to you by Teacher Created Materials, supporting learning in and out of the classroom for over 45 years! These Subtraction Flash Cards are a fun way for early learners to grasp, practice, and memorize basic subtraction problems. Designed for various learning, practice, and play scenarios, these boldly colorful cards are perfect for classroom or at-home use.